8 Then he moved to the fluid adjustment, which is the control that adjusts the distance that the fluid needle will travel back, away from the fluid tip, with each pull of the trigger. Vic recommends setting the fluid adjustment like this. Start by unscrewing the fluid control (bottom knob) almost completely. Next, pull the trigger back to the fully open position and screw the fluid control in until you feel a force from the backside of the trigger. Setting the fluid adjustment in this manner will allow full fluid volume to exit your spray gun. Since the fan has not been adjusted, we are getting a round spray pattern.